2c Black, Die I, Large Die Proof on India (73P1). On 72 x 88mm card, large red "SPECIMEN" overprint across design, fresh and Very Fine, from a National Bank Note Co. sample book, the Die I proof is extremely rare (catalogues $10,000.00 in Scott), none were offered in major Black Jack sales, except with the "Specimen" overprint as offered here, with 1977 P.F. certificate

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